As far as Khan's chin goes, it's clearly not as bad as everyone initially thought, he's pretty durable. However, he did seem to get numbed a few times and Peterson is no big puncher. When he does do his bravado after getting hit, it's not that convincing, it's not like say Froch, who gets clubbed and you can genuinely see him unswayed, even enjoying it and it's like 'right then, nice shot, lets give you one'... Still, it's unfair to compare his chin with Froch's. All in all I'd say his chin of late has looked durable, but still questionable to some degree. As far as Khan's heart in the ring goes, I'd say he's got a very good one, that can't be questioned.
Phew. I was worried about you for a minute, and after te compliment I paid you in another thread :bart